The Howard Hughes Professional and Aeronautical Photographs contain black-and-white photographs of businessman and entrepreneur Howard Hughes and his companies from 1916 to 1997. The photographs primarily depict Hughes alongside his aircraft, including the XF-11 prototype reconnaissance plane and the HK-1 Hercules, better known as the "Spruce Goose" or "Flying Boat." The photographs also cover the companies owned by Hughes, including Hughes Tool Company, Hughes Aircraft Company, Hughes Electronics Corporation, and RKO Pictures.

The Hughes Aircraft Retirees Association (HARA) Records (1940-2018) contain a variety of publications, organizational charts and technical reports, audiovisual materials, and photographs related to Hughes Aircraft Company and Hughes Electronics. These materials were gathered by members of the Hughes Aircraft Retirees Association, a social organization for retirees of Hughes Aircraft Company including Boeing, Raytheon, and Kinecta.

The Hugh Henry Brown Papers consist of professional and personal papers (1902-1927) from Hugh Henry Brown, who was a lawyer in Tonopah, Nevada. The professional communication focuses on Brown's law practice dealing primarily with mining and railroad companies in Central Nevada. The papers also contain receipts from purchases made by Brown or his wife, Marjorie Moore Brown.